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Originally Posted by geoffretired Aragorn,
When the gun shoots upwards isn't that the result of it trying to jump back plus the fact that it is held below the barrel causing torque? In trying to jump back it does what it can, which is to rotate backwards.
In a bow, the same sort of things must try to happen, they just produce different results. The arrow, string, limbs go forward and the riser goes back towards the archer. Then the energy, still in the limbs, is carried into the riser to push it forwards eventually. It is the jumping back of the riser that activates the inertia drop away rests. Newton said action and reaction etc
If one part goes forward something must go back; it isn't the string,arrow or limb tips so what's left? |
Hmmm. I think that's a little too simplistic.
When you release the string, what moves the riser forward? Gravity (well, that's a rotational movement, really...), and the push from your hand (your hand must be pushing against it, otherwise you'd have a riser in the face...). What's moving the riser backwards? The only thing I can think of is the reaction from the arrow. The arrow is a tiny fraction of the mass of the riser, so the riser will actually not get an appreciable acceleration in that direction. This ignores the movement of the limbs, of course, but they're light compared to the riser as well (just not as light as the arrow). The net acceleration of the riser is always going to be forwards, I think. But it's a complex situation.
31-03-06, 02:51 PM
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